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## anonymous 4 years ago Find the exact value of the expression. Do not use a calculator. If tan θ = 9, find the exact value of cot (pi/2 - θ)

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1. anonymous

A. 8 B. 10 C. 1/9 D. 9

2. anonymous

don't be fooled, it is the cofunction identity $\cot(\frac{\pi}{2}-\theta)=\tan(\theta)$

3. anonymous

therefore if $$\tan(\theta)=9$$ you know $$\cot(\frac{\pi}{2}-\theta)=9$$ also

4. anonymous

thank you

5. anonymous

its d) 9

6. anonymous

yes

7. anonymous

too simple

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